HSRP

Configuring HSRP:

       ·         Hot Standby Redundancy Protocol

·         Cisco Proprietary

·         Default priority is 100

·         Default MAC address for Cisco: 0000.0c07.acxx -> xx is the HSRP Group number

·         There is no preemption by default

   ·         Let me take a small topology to configure HSRP

 

R1----LAN------R2-------LAN------R4 (10.1.124.0/24)

R1----Ser1/0---------------------------Ser1/0----R3

10.1.1.1                                   10.1.1.3

Configuring HSRP between R1 and R2:

R1(config-if)#

R1(config-if)#do sho run int fa0/0

Building configuration...

Current configuration : 164 bytes

!

interface FastEthernet0/0

 ip address 10.1.124.1 255.255.255.0

 duplex auto

 speed auto

 standby 1 ip 10.1.124.10

 standby 1 priority 150

 standby 1 preempt

end

 

R1(config-if)#

R1(config-if)#

*Mar  1 00:14:53.451: %HSRP-5-STATECHANGE: FastEthernet0/0 Grp 1 state Speak -> Standby

*Mar  1 00:14:53.951: %HSRP-5-STATECHANGE: FastEthernet0/0 Grp 1 state Standby -> Active

 

R2(config-if)#do show run int fa0/0

Building configuration...

 

Current configuration : 140 bytes

!

interface FastEthernet0/0

 ip address 10.1.124.2 255.255.255.0

 duplex auto

 speed auto

 standby 1 ip 10.1.124.10

 standby 1 preempt

end

 

R2(config-if)#

R2(config-if)#

*Mar  1 00:15:13.895: %HSRP-5-STATECHANGE: FastEthernet0/0 Grp 1 state Speak -> Standby

 

R4(config-if)#do show run int fa0/0

Building configuration...

 

Current configuration : 95 bytes

!

interface FastEthernet0/0

 ip address 10.1.124.4 255.255.255.0

 duplex auto

 speed auto

end

 

R4(config-if)#

 

Verification:

 

R1#show standby

FastEthernet0/0 - Group 1

  State is Active

    2 state changes, last state change 00:17:58

  Virtual IP address is 10.1.124.10

  Active virtual MAC address is 0000.0c07.ac01

    Local virtual MAC address is 0000.0c07.ac01 (v1 default)

  Hello time 3 sec, hold time 10 sec

    Next hello sent in 1.488 secs

  Preemption enabled

  Active router is local

  Standby router is 10.1.124.2, priority 100 (expires in 7.000 sec)

  Priority 150 (configured 150)

  IP redundancy name is "hsrp-Fa0/0-1" (default)

R1#

 

R2#show standby

FastEthernet0/0 - Group 1

  State is Standby

    1 state change, last state change 00:18:31

  Virtual IP address is 10.1.124.10

  Active virtual MAC address is 0000.0c07.ac01

    Local virtual MAC address is 0000.0c07.ac01 (v1 default)

  Hello time 3 sec, hold time 10 sec

    Next hello sent in 1.476 secs

  Preemption enabled

  Active router is 10.1.124.1, priority 150 (expires in 6.972 sec)

  Standby router is local

  Priority 100 (default 100)

  IP redundancy name is "hsrp-Fa0/0-1" (default)

R2#

 

R4#ping 10.1.124.10

 

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 10.1.124.10, timeout is 2 seconds:

.!!!!

Success rate is 80 percent (4/5), round-trip min/avg/max = 4/26/48 ms

R4#telnet 10.1.124.10

Trying 10.1.124.10 ... Open

 

 

User Access Verification

 

Password:

R1>

 

Observation:

·         HSRP is up between R1 and R2

·         R1 is Active router

·         R2 is Standby router

·         That is the reason when R4 tried to telnet 10.1.124.10, it went to R1

 

·         Now, let me shut the interface in R1 router and see

 

R1(config)#int fa0/0

R1(config-if)#shut

R1(config-if)#

*Mar  1 00:37:12.439: %HSRP-5-STATECHANGE: FastEthernet0/0 Grp 1 state Active -> Init

R1(config-if)#

*Mar  1 00:37:14.447: %LINK-5-CHANGED: Interface FastEthernet0/0, changed state to administratively down

*Mar  1 00:37:15.447: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, changed state to down

R1(config-if)#

 

R2(config)#

*Mar  1 00:37:12.879: %HSRP-5-STATECHANGE: FastEthernet0/0 Grp 1 state Standby -> Active

R2(config)#

 

R1(config-if)#do show standby

FastEthernet0/0 - Group 1

  State is Init (interface down)

    3 state changes, last state change 00:00:47

  Virtual IP address is 10.1.124.10

  Active virtual MAC address is unknown

    Local virtual MAC address is 0000.0c07.ac01 (v1 default)

  Hello time 3 sec, hold time 10 sec

  Preemption enabled

  Active router is unknown

  Standby router is unknown

  Priority 150 (configured 150)

  IP redundancy name is "hsrp-Fa0/0-1" (default)

R1(config-if)#

 

R2(config)#do show standby

FastEthernet0/0 - Group 1

  State is Active

    2 state changes, last state change 00:01:20

  Virtual IP address is 10.1.124.10

  Active virtual MAC address is 0000.0c07.ac01

    Local virtual MAC address is 0000.0c07.ac01 (v1 default)

  Hello time 3 sec, hold time 10 sec

    Next hello sent in 0.756 secs

  Preemption enabled

  Active router is local

  Standby router is unknown

  Priority 100 (default 100)

  IP redundancy name is "hsrp-Fa0/0-1" (default)

R2(config)#

 

R4#ping 10.1.124.10

 

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 10.1.124.10, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 4/22/52 ms

R4#

R4#telnet 10.1.124.10

Trying 10.1.124.10 ... Open

 

 

User Access Verification

 

Password:

R2>

 

Observation:

·         Shut the Fa0/0 interface in R1

·         Now, R2 is Active router

·         R1 is Standby router

·         That is the reason when R4 tried to telnet 10.1.124.10, it went to R2

 

·         Now, let me Bring back R1 as Active

 

 

R1(config-if)#no shut

R1(config-if)#

*Mar  1 00:39:12.483: %HSRP-5-STATECHANGE: FastEthernet0/0 Grp 1 state Listen -> Active

R1(config-if)#

*Mar  1 00:39:12.915: %LINK-3-UPDOWN: Interface FastEthernet0/0, changed state to up

*Mar  1 00:39:13.915: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, changed state to up

R1(config-if)#

 

R2(config)#

*Mar  1 00:39:12.927: %HSRP-5-STATECHANGE: FastEthernet0/0 Grp 1 state Active -> Speak

R2(config)#

*Mar  1 00:39:22.927: %HSRP-5-STATECHANGE: FastEthernet0/0 Grp 1 state Speak -> Standby

R2(config)#

 

·         Now, let me configure interface tracking in R1 router

 

R1(config-if)#standby 1 track serial 1/0 51

 

R3(config-if)#int ser1/0

R3(config-if)#shut

R3(config-if)#

 

R1(config-if)#

*Mar  1 00:41:15.987: %TRACKING-5-STATE: 1 interface Se1/0 line-protocol Up->Down

*Mar  1 00:41:16.647: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial1/0, changed state to down

R1(config-if)#

*Mar  1 00:41:18.555: %HSRP-5-STATECHANGE: FastEthernet0/0 Grp 1 state Active -> Speak

R1(config-if)#

*Mar  1 00:41:28.555: %HSRP-5-STATECHANGE: FastEthernet0/0 Grp 1 state Speak -> Standby

R1(config-if)#

 

R2(config)#

*Mar  1 00:39:12.927: %HSRP-5-STATECHANGE: FastEthernet0/0 Grp 1 state Active -> Speak

R2(config)#

*Mar  1 00:39:22.927: %HSRP-5-STATECHANGE: FastEthernet0/0 Grp 1 state Speak -> Standby

R2(config)#

*Mar  1 00:41:18.907: %HSRP-5-STATECHANGE: FastEthernet0/0 Grp 1 state Standby -> Active

R2(config)#

 

R1(config-if)#do show standby

FastEthernet0/0 - Group 1

  State is Standby

    6 state changes, last state change 00:00:37

  Virtual IP address is 10.1.124.10

  Active virtual MAC address is 0000.0c07.ac01

    Local virtual MAC address is 0000.0c07.ac01 (v1 default)

  Hello time 3 sec, hold time 10 sec

    Next hello sent in 1.140 secs

  Preemption enabled

  Active router is 10.1.124.2, priority 100 (expires in 7.112 sec)

  Standby router is local

  Priority 99 (configured 150)

    Track interface Serial1/0 state Down decrement 51

  IP redundancy name is "hsrp-Fa0/0-1" (default)

R1(config-if)#

 

R2(config)#do show standby

FastEthernet0/0 - Group 1

  State is Active

    5 state changes, last state change 00:01:14

  Virtual IP address is 10.1.124.10

  Active virtual MAC address is 0000.0c07.ac01

    Local virtual MAC address is 0000.0c07.ac01 (v1 default)

  Hello time 3 sec, hold time 10 sec

    Next hello sent in 0.700 secs

  Preemption enabled

  Active router is local

  Standby router is 10.1.124.1, priority 99 (expires in 8.772 sec)

  Priority 100 (default 100)

  IP redundancy name is "hsrp-Fa0/0-1" (default)

R2(config)#

 

Observation:

·         Interface tracking is configured in R1, for Ser1/0

·         Its configured in such a way that if Ser1/0 goes down, R1’s HSRP will decrement by 51 and becomes 99

·         Once the R1’s Ser1/0 is down, R1’s HSRP priority became 99 and R2 became Active.

 

R1(config-if)#no shut

*Mar  1 00:43:05.995: %TRACKING-5-STATE: 1 interface Se1/0 line-protocol Down->Up

*Mar  1 00:43:06.511: %HSRP-5-STATECHANGE: FastEthernet0/0 Grp 1 state Standby -> Active

*Mar  1 00:43:06.639: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial1/0, changed state to up

R1(config-if)#

 

R2(config)#

*Mar  1 00:43:06.939: %HSRP-5-STATECHANGE: FastEthernet0/0 Grp 1 state Active -> Speak

R2(config)#

*Mar  1 00:43:16.939: %HSRP-5-STATECHANGE: FastEthernet0/0 Grp 1 state Speak -> Standby

R2(config)#